3. Check for Bad Blocks before Building Filesystem

As shown below, -c option will check for bad blocks before it creates the filesystem. Depending on the size of your filesystem, the “Checking for bad blocks (read-only test):” line in the following output, might take a very long time to complete.

As you see in the following example, it took me around 7 minutes, to even get to 67% of the bad blocks checking.